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A cross from Alexian Brothers Hospital on display at the City Museum in St. Louis. The cross was used to perform an exorcism on a boy believed to be possessed by the devil and was later featured in The Exorcist.

Inside the City Museum in St. Louis.

At the Bob Bullock Texas State History Museum in Austin, TX, is a barrel that was salvaged from the waters off the Texas coast. But what did it hold and how does it tell the story of the La Belle shipwreck?

Artifacts on display at the International Spy Museum in Washington, DC.

Caves inside the City Museum in St Louis.

The Abita Mystery House and UCM Museum in Abita Springs, LA.

A surveillance camera at the International Spy Museum in Washington, DC.

Gargoyles at the City Museum in St. Louis.

Rural swamps near Abita Springs, LA.

Canine war hero Sergeant Stubby and various objects from World War I on display at the Smithsonian National Museum of American History in Washington, DC.

The City Museum in St Louis.

The Abita Mystery House and UCM Museum in Abita Springs, LA, where Don investigates the plaster mold of a giant footprint believed to have been left by the Honey Island Swamp Monster.

A stained-glass window from the Alexian Brothers Hospital in St Louis.